<!-- Source: https://docs.marimo.io/api/inputs/array/ -->

# Array

[Interactive marimo example](https://marimo.app/?embed=true&mode=edit&show-chrome=false#code/JYWwDg9gTgLgBCAhlUEBQixjgXgc1AOgEEsAKAd2ABMYALHAIhAFNrgBXERgSjTQACmMIQDGLADYS01FgDM4AfUVkeALjRwtcUJFj4UICHEQBnBOm1woLGBygA7QcLGTpshctUarVU3VwLQg5gQhgWAA8YMjAJRHE6CAlZKCYAdWB-Xk1tPzoWczwjYNDkKEQATzIAbTyAXTgAKjgAZgAaODiAI0kmABU6GxY4PILsqxs7R34hLFcpGXklFXUcrWK6Uxh4gGsa0dMOg8IAN0QJDhY6joArDi3gOQqmUzB4lgBaHpgKFhYHcbaSb2JxAA)

## marimo.ui.array

```python
array(
    elements: Sequence[UIElement[Any, Any]],
    *,
    label: str = "",
    on_change: Callable[[Sequence[object]], None]
    | None = None,
)
```

Bases: `UIElement[dict[str, JSONType], Sequence[object]]`

An array of UI elements.

Use an array to:
- create a dynamic number of UI elements at runtime
- group together logically related UI elements
- keep the number of global variables in your program small

Access the values of the elements using the `value` attribute of the array
(`array.value`).

The elements in the array can be accessed using square brackets
(`array[index]`) and embedded in other marimo outputs. You can also
iterate over the UI elements using the `in` operator (`for element in
array`).

Note: The UI elements in the array are clones of the original elements:
interacting with the array will *not* update the original elements, and
vice versa.

Examples:

A heterogeneous collection of UI elements:

```python
array = mo.ui.array([mo.ui.slider(1, 10), mo.ui.text(), mo.ui.date()])
```

Get the values of the `slider`, `text`, and `date` elements via
`array.value`:

```python
# array.value returns a list with the values of the elements
array.value
```

Access and output a UI element in the array:

```python
mo.md(f"This is a slider: array[0]")
```

Some number of UI elements, determined at runtime:

```python
mo.ui.array([mo.ui.slider(1, 10) for _ in range random.randint(4, 8)])
```

| ATTRIBUTE | DESCRIPTION |
| --- | --- |
| `[value](#marimo.ui.array.value)` | A list containing the values of the array's entries. **TYPE:** `list` |
| `[elements](#marimo.ui.array.elements)` | A list of the wrapped elements (clones of the originals). **TYPE:** `list` |

| PARAMETER | DESCRIPTION |
| --- | --- |
| `elements` | The UI elements to include. **TYPE:** `Sequence[UIElement]` |
| `label` | A descriptive name for the array. Defaults to "". **TYPE:** `str` **DEFAULT:** `''` |
| `on_change` | Optional callback to run when this element's value changes. **TYPE:** `Optional[Callable[[Sequence[object]], None]]` **DEFAULT:** `None` |

### elements `property`

```python
elements: Sequence[UIElement[JSONType, object]]
```

### text `property`

```python
text: str
```

A string of HTML representing this element.

### value `property` `writable`

```python
value: T
```

The element's current value.

### batch

```python
batch(**elements: UIElement[Any, Any]) -> batch
```

Convert an HTML object with templated text into a UI element.

This method lets you create custom UI elements that are represented
by arbitrary HTML.

> **Example**
>
> ```python3
> user_info = mo.md(
>     '''
>     - What's your name?: {name}
>     - When were you born?: {birthday}
>     '''
> ).batch(name=mo.ui.text(), birthday=mo.ui.date())
> ```
> In this example, `user_info` is a UI Element whose output is markdown
> and whose value is a dict with keys `'name'` and '`birthday`'
> (and values equal to the values of their corresponding elements).

| PARAMETER | DESCRIPTION |
| --- | --- |
| `elements` | the UI elements to interpolate into the HTML template. **TYPE:** `UIElement[Any, Any]` **DEFAULT:** `{}` |

### callout

```python
callout(
    kind: Literal[
        "neutral", "danger", "warn", "success", "info"
    ] = "neutral",
) -> Html
```

Create a callout containing this HTML element.

A callout wraps your HTML element in a raised box, emphasizing its
importance. You can style the callout for different situations with the
`kind` argument.

Examples:

```python3
mo.md("Hooray, you did it!").callout(kind="success")
```

```python3
mo.md("It's dangerous to go alone!").callout(kind="warn")
```

### center

```python
center() -> Html
```

Center an item.

> **Example**
>
> ```python3
> mo.md("# Hello, world").center()
> ```

| RETURNS | DESCRIPTION |
| --- | --- |
| `[Html](https://docs.marimo.io/api/html/#marimo.Html)` | An `Html` object. |

### form

```python
form(
    label: str = "",
    *,
    bordered: bool = True,
    loading: bool = False,
    submit_button_label: str = "Submit",
    submit_button_tooltip: str | None = None,
    submit_button_disabled: bool = False,
    clear_on_submit: bool = False,
    show_clear_button: bool = False,
    clear_button_label: str = "Clear",
    clear_button_tooltip: str | None = None,
    validate: Callable[[JSONType | None], str | None]
    | None = None,
    on_change: Callable[[T | None], None] | None = None,
) -> form[S, T]
```

Create a submittable form out of this `UIElement`.

Creates a form that gates submission of a `UIElement`'s value until a submit button is clicked.
The form's value is the value of the underlying element from the last submission.

Examples:

Convert any `UIElement` into a form:
```python
prompt = mo.ui.text_area().form()
```

Combine with `HTML.batch` to create a form made out of multiple `UIElements`:
```python
form = (
    mo.md(
        '''
    **Enter your prompt.**

    {prompt}

    **Choose a random seed.**

    {seed}
    '''
    )
    .batch(
        prompt=mo.ui.text_area(),
        seed=mo.ui.number(),
    )
    .form()
)
```

| PARAMETER | DESCRIPTION |
| --- | --- |
| `label` | A text label for the form. **TYPE:** `str` **DEFAULT:** `''` |
| `bordered` | Whether the form should have a border. **TYPE:** `bool` **DEFAULT:** `True` |
| `loading` | Whether the form should be in a loading state. **TYPE:** `bool` **DEFAULT:** `False` |
| `submit_button_label` | The label of the submit button. **TYPE:** `str` **DEFAULT:** `'Submit'` |
| `submit_button_tooltip` | The tooltip of the submit button. **TYPE:** `str \| None` **DEFAULT:** `None` |
| `submit_button_disabled` | Whether the submit button should be disabled. **TYPE:** `bool` **DEFAULT:** `False` |
| `clear_on_submit` | Whether the form should clear its contents after submitting. **TYPE:** `bool` **DEFAULT:** `False` |
| `show_clear_button` | Whether the form should show a clear button. **TYPE:** `bool` **DEFAULT:** `False` |
| `clear_button_label` | The label of the clear button. **TYPE:** `str` **DEFAULT:** `'Clear'` |
| `clear_button_tooltip` | The tooltip of the clear button. **TYPE:** `str \| None` **DEFAULT:** `None` |
| `validate` | A function that takes the form's value and returns an error message if invalid, or `None` if valid. **TYPE:** `Callable[[JSONType \| None], str \| None] \| None` **DEFAULT:** `None` |
| `on_change` | Optional callback to run when this element's value changes. Defaults to None. **TYPE:** `Callable[[T \| None], None] \| None` **DEFAULT:** `None` |

### from\_args `classmethod`

```python
from_args(
    data: dict[str, int],
    args: InitializationArgs[S, T],
    memo: dict[int, Any] | None = None,
    basis: UIElement[S, T] | None = None,
) -> UIElement[S, T]
```

### hstack

```python
hstack(**kwargs: Any) -> Html
```

Stack the elements horizontally.

| PARAMETER | DESCRIPTION |
| --- | --- |
| `**kwargs` | Additional arguments passed to `marimo.hstack`. **TYPE:** `Any` **DEFAULT:** `{}` |

| RETURNS | DESCRIPTION |
| --- | --- |
| `Html` | HTML representation of horizontally stacked elements. **TYPE:** `[Html](https://docs.marimo.io/api/html/#marimo.Html)` |

### left

```python
left() -> Html
```

Left-justify.

> **Example**
>
> ```python3
> mo.md("# Hello, world").left()
> ```

| RETURNS | DESCRIPTION |
| --- | --- |
| `[Html](https://docs.marimo.io/api/html/#marimo.Html)` | An `Html` object. |

### right

```python
right() -> Html
```

Right-justify.

> **Example**
>
> ```python3
> mo.md("# Hello, world").right()
> ```

| RETURNS | DESCRIPTION |
| --- | --- |
| `[Html](https://docs.marimo.io/api/html/#marimo.Html)` | An `Html` object. |

### style

```python
style(
    style: dict[str, Any] | None = None, **kwargs: Any
) -> Html
```

Wrap an object in a styled container.

> **Example**
>
> ```python
> mo.md("...").style({"max-height": "300px", "overflow": "auto"})
> mo.md("...").style(max_height="300px", overflow="auto")
> ```

| PARAMETER | DESCRIPTION |
| --- | --- |
| `style` | an optional dict of CSS styles, keyed by property name **TYPE:** `dict[str, Any] \| None` **DEFAULT:** `None` |
| `**kwargs` | CSS styles as keyword arguments **TYPE:** `Any` **DEFAULT:** `{}` |

### vstack

```python
vstack(**kwargs: Any) -> Html
```

Stack the elements vertically.

| PARAMETER | DESCRIPTION |
| --- | --- |
| `**kwargs` | Additional arguments passed to `marimo.vstack`. **TYPE:** `Any` **DEFAULT:** `{}` |

| RETURNS | DESCRIPTION |
| --- | --- |
| `Html` | HTML representation of vertically stacked elements. **TYPE:** `[Html](https://docs.marimo.io/api/html/#marimo.Html)` |